This photo was taken by Uwe Kils. It shows an amphipod, a type of plankton. The photo was taken using magnification so users can see the amphipod in detail. In reality, most amphipods are only 1 mm to 140 mm in length.
Click on image for full sizeCourtesy of Wikipedia Commons

They can be so tiny that you can't see them with your eye. You'd need a microscope! They can also be bigger like jellyfish, mollusks, and crustaceans. Remember, if it depends on water moving to move side to side, it's plankton!

Plankton are usually divided into three groups - phytoplankton which use photosynthesis to make food, zooplankton which depend on other organisms for food, and bacterioplankton which are the bacteria that drift in open water.

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